Peco PC21406A Bimetal Overload Relay Type PNR-2 With SPP

Peco PC 21406 A Bimetal Overload Relay Type PNR-2 With SPP .A bimetal overload relay is an electrical device used to protect motors and other electrical equipment from damage caused by excessive current. It is an integral component of motor control systems and is designed to sense and respond to overcurrent conditions.

The relay consists of two different metals bonded together to form a bimetallic strip. These metals have different coefficients of thermal expansion, meaning they expand at different rates when heated. The bimetallic strip is positioned in the current path of the circuit being protected.

When the current flowing through the circuit exceeds a preset threshold, the bimetallic strip heats up due to the resistive heating effect. As the temperature rises, the metals in the strip expand at different rates, causing the strip to bend or deform. This bending action triggers a mechanical mechanism within the relay.

The mechanical mechanism typically operates a set of contacts, which are used to open or close the circuit. In the case of an overload condition, the contacts open, interrupting the current flow and disconnecting the equipment from the power source. This prevents the motor or equipment from further damage caused by excessive current.

Once the current drops to a safe level, the bimetallic strip cools down and returns to its original position, allowing the contacts to close and restore power to the equipment.

Bimetal overload relays are reliable, cost-effective devices widely used in industrial applications to protect motors and electrical systems from overcurrent conditions. They provide an essential safeguard against motor burnout and equipment failure, ensuring the longevity and safe operation of electrical systems.

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